Piston



A. P. NUTE June 17, 1930.

PISTON Filed July 30. 1928 I kin vi'eni for?- By v l i 4 P tented June f17,f 19'30 'T NI ED V v RTHiIB' I; i 'flr rrsiron pplicat on filed July Q I ."lhisfinventionrelates to pistonsforinter-H nal combustion" engines; for motor Vehicles, av atlon and marlne workand has forits bj'ect the provisionlof a piston which will r jtain'and supply lubricantbetween-"the thrust r surfaces of the piston and the cylinder walls" when the engine is started and before the J normal lubrication of'the engine is estab-' -,,lished'. f i .1 1 '10. 'WhenHan internal. combustionengineis j permitted to stand idle the lubricant drains f a into the; crank case leaving the cylinder walls I free of lubricant and dry. lf theengine is I f startedvthe pistons are thrust-up and down; against the cylinder-walls without'lubricant; untilthe' normal lubrication oi the engine is established. This causes more damageto the I a J, pistons and-cylinderrw allsthanis caused by 'f normal running offthe engine'for longiperiods. In order to overcome this difliculty it has "been suggested to provide an annular groove in the wall ofthe piston to retain a supply of lubricant which will be. available when the engine is started. Sucha groove has not been satisfactory because the lubri- ,c'ant retained the-rein drains out if the ve- I i hicle is stopped whilein an inclined position. Inaccordance with the invention one or Hinore' lubricant v retaining pockets" are proton. ,Thesepockets are arranged withside and; end walls and a bottom and an opening 7 adjacent the thrust surface of the piston to f ,trap lubricant regardless of the tilt of the face of the piston. 1 I g e "The invention'will be more clearly under stood from thefollowing description in'con.-' junction with theaccompanying drawings; intwhich, 7 Fig. 'l is an elevational view of a piston embodying the invention. Fig; 2 is a sectional I L elevational View through one ofthe oil retainingpockets;

I Fig; 3 is aplan View looking froni the botto nof the piston. i

is an elevational View of the piston ie'zsigse i im eeasos L 1" wa ly; il

Vided'adj acent each thrust sur'face of the pis engine in any direction. Preferably, each 4 pocket is inclined upwardlyandoutwardly 7 a andfcommunicates with a groovev extending ina peripheral pathjacross thefthrustsur in tiate, is ilt di nd lI-ig; hele at' ne V 01 iii-Pi ton; emhndyingfthe iiliien i on in m;

fied forln. r Arist ill ns-e rpl t nheadb i da t' ln s irtfifiwh s-ioompls 1 y airesiit i bumte en ial w y;nannulalzldtiflu l eg gr'oo 51.1 i

al we rdly} rom;-.tne perip eryg 6 nr rid dlr th t n. t ffenin thess m 77:, a

a 1 :isw nec htheski fiibyare re 0m amen the inyention the pockets open intoahorizonv p r 18 extendingin aperipheralpath tal groove I across a thrust surface ofthe' piston.

sfipemted f m hfi headaj n ,ei k whehf f r bodyi-ng the nventionconlprismeant I he irtkfl; a e

Wil I ewpmkew J 9 -Wh'enthe piston of the ir'ivention is, asserne bled in an internal combustion engine andtlie engine is eppo a' h f c ntl p nt e-C3 1? 1 inder wallsaccumulatesf inthe groove 18and 1 drains downandfills theipockets 15. :Wh 'nf the engine is again started the lubricant thus 1 f trappedin'the pockets 15; is thrown ups'pread 7 i ing out in the grooir'ed8jagainst the cylinder] I walls andthj'erebyfurnishing lubrication-be.i 7 r tween the thrust surface off the;piston and 9 the cylinder walls until thelnormal llubrica-f or tionofthe engine'iisestablished.Tltwillibew.

noted, as illustratedin 4, that regardless of the angle at which the engine stands the lubricant trapped in the pockets cannot drain out, and therefore there is always available sufficient oil to give the walls a preliminary lubrication; My invention therefore overcomes the danger of dry cylinder walls whichioccurs when an engine stands, and

i adds verygreatly to the life of the engine.

This is accomplished at practically no ex: pense since pistons emhodyingmy invention. I

of standard cost little or-nomore thanthose vconstruction. V g V What I claim is: K r

1. A piston for" an internal combustion en; i gine having a deep lubricant retaining pocket extending l'rom a thrustsurface ofthe piston,

the width of the mouth of said pocket measured on the-periphery of the piston being piston. 7

small incomparison with the peripheryof the e V 2. Apistonfor an internal'combustion en ginejhavin'g a deepluricant retaining pocket extending inwardlyand downwardly from a thrust su-rfaceof-the piston, the width ofthe J mouth of [said pocket measured on the pe-i riphery' of thepiston being small in comeparison with the periphery of the piston." V

3. A piston for ai-rinternal combustion en g ine having'a deep lubricant retaining pocket extending froina thrust surface of the piston}; I the width of the mouth of said pocket meas' ured on the peripheryofthepiston being" small in comparison with the periphery of the piston,'and a groove extending i'na pe ripheral path acrossathrust surface offthe piston and communicating with said pocket.

A piston for an internal combustionengine ha-v inga' deep lubricant retaini-ngpocket extending inwardly 'anddownwardly from a thrust surface of the piston, the width of the mouth of said pocket measured on the pe-f ripheryof the piston being small in compari-" son' with the" periphery ofthe piston, and a I groove extending in a peripheralpath across athrust surface of the eating with-said pocket. I V In testimony whereof I aflix my signature;

piston'and ommune 

